Apparatus

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sensors Mode-S transponder

A4D520

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N410LF · BELL 407 · operated by LIFE FLIGHT NETWORK LLC

Hex
A4D520
Octal
51152440
Decimal
10,802,464
Country
US
Tail
N410LF
Type
B407
No current signal · last broadcast 12h ago
Flights observed
23
Distinct callsigns
1
Country
US
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S A4D520.

Country allocation

The ICAO 24-bit address A4D520 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N410LF - 23 2026-04-18

Recent flights last 23

DateFlightRouteTakeoffLandingDuration
2026-04-18 N410LF - Apr 18, 05:25 UTCApr 18, 06:35 UTC1h 10m
2026-04-18 N410LF - Apr 18, 05:10 UTCApr 18, 05:20 UTC10m
2026-04-17 N410LF - Apr 17, 22:35 UTCApr 17, 23:05 UTC30m
2026-04-17 N410LF - Apr 17, 21:25 UTCApr 17, 21:40 UTC15m
2026-04-17 N410LF - Apr 17, 20:40 UTCApr 17, 21:20 UTC40m
2026-04-17 N410LF - Apr 17, 07:30 UTCApr 17, 09:00 UTC1h 30m
2026-04-17 N410LF - Apr 17, 05:50 UTCApr 17, 06:20 UTC30m
2026-04-17 N410LF - Apr 17, 03:20 UTCApr 17, 04:30 UTC1h 10m
2026-04-17 N410LF - Apr 17, 02:40 UTCApr 17, 03:15 UTC35m
2026-04-17 N410LF - Apr 17, 01:20 UTCApr 17, 02:05 UTC45m
2026-04-17 N410LF - Apr 17, 00:20 UTCApr 17, 01:15 UTC55m
2026-04-16 N410LF - Apr 16, 21:30 UTCApr 16, 22:00 UTC30m
2026-04-16 N410LF - Apr 16, 20:40 UTCApr 16, 20:55 UTC15m
2026-04-16 N410LF - Apr 16, 09:15 UTCApr 16, 09:39 UTC25m
2026-04-16 N410LF - Apr 16, 07:54 UTCApr 16, 08:54 UTC1h 0m
2026-04-16 N410LF - Apr 16, 04:24 UTCApr 16, 04:54 UTC30m
2026-04-16 N410LF - Apr 16, 03:24 UTCApr 16, 03:49 UTC25m
2026-04-16 N410LF - Apr 16, 02:54 UTCApr 16, 03:04 UTC10m
2026-04-15 N410LF - Apr 15, 02:55 UTCApr 15, 03:10 UTC15m
2026-04-14 N410LF - Apr 14, 23:05 UTCApr 15, 00:10 UTC1h 5m
2026-04-14 N410LF - Apr 14, 21:45 UTCApr 14, 22:40 UTC55m
2026-04-14 N410LF - Apr 14, 19:10 UTCApr 14, 19:40 UTC30m
2026-04-14 N410LF - Apr 14, 17:55 UTCApr 14, 18:45 UTC50m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N410LF page for operator, model, and routing details .

Mode-S A4D520 frequently asked

What is Mode-S code A4D520?
A4D520 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N410LF.
Where is Mode-S A4D520 registered?
Mode-S code A4D520 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4D520 broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4D520, octal 51152440, decimal 10,802,464.
What flights does A4D520 operate?
Mode-S A4D520 has broadcast 1 distinct callsign, including N410LF.